boost/date_time/local_time/custom_time_zone.hpp
#ifndef LOCAL_TIME_CUSTOM_TIME_ZONE_HPP__ #define LOCAL_TIME_CUSTOM_TIME_ZONE_HPP__ /* Copyright (c) 2003-2005 CrystalClear Software, Inc. * Subject to the Boost Software License, Version 1.0. * (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) * Author: Jeff Garland, Bart Garst * $Date$ */ #include "boost/date_time/time_zone_base.hpp" #include "boost/date_time/time_zone_names.hpp" #include "boost/date_time/posix_time/posix_time.hpp" #include "boost/date_time/local_time/dst_transition_day_rules.hpp" #include "boost/date_time/string_convert.hpp" //#include "boost/date_time/special_defs.hpp" #include "boost/shared_ptr.hpp" namespace boost { namespace local_time { //typedef boost::date_time::time_zone_names time_zone_names; typedef boost::date_time::dst_adjustment_offsets<boost::posix_time::time_duration> dst_adjustment_offsets; //typedef boost::date_time::time_zone_base<boost::posix_time::ptime> time_zone; typedef boost::shared_ptr<dst_calc_rule> dst_calc_rule_ptr; //! A real time zone template<class CharT> class custom_time_zone_base : public date_time::time_zone_base<posix_time::ptime,CharT> { public: typedef boost::posix_time::time_duration time_duration_type; typedef date_time::time_zone_base<posix_time::ptime,CharT> base_type; typedef typename base_type::string_type string_type; typedef typename base_type::stringstream_type stringstream_type; typedef date_time::time_zone_names_base<CharT> time_zone_names; typedef CharT char_type; custom_time_zone_base(const time_zone_names& zone_names, const time_duration_type& utc_offset, const dst_adjustment_offsets& dst_shift, boost::shared_ptr<dst_calc_rule> calc_rule) : zone_names_(zone_names), base_utc_offset_(utc_offset), dst_offsets_(dst_shift), dst_calc_rules_(calc_rule) {} virtual ~custom_time_zone_base() {} virtual string_type dst_zone_abbrev() const { return zone_names_.dst_zone_abbrev(); } virtual string_type std_zone_abbrev() const { return zone_names_.std_zone_abbrev(); } virtual string_type dst_zone_name() const { return zone_names_.dst_zone_name(); } virtual string_type std_zone_name() const { return zone_names_.std_zone_name(); } //! True if zone uses daylight savings adjustments virtual bool has_dst() const { return (bool) dst_calc_rules_; //if calc_rule is set the tz has dst } //! Local time that DST starts -- NADT if has_dst is false virtual posix_time::ptime dst_local_start_time(gregorian::greg_year y) const { gregorian::date d(gregorian::not_a_date_time); if (dst_calc_rules_) { d = dst_calc_rules_->start_day(y); } return posix_time::ptime(d, dst_offsets_.dst_start_offset_); } //! Local time that DST ends -- NADT if has_dst is false virtual posix_time::ptime dst_local_end_time(gregorian::greg_year y) const { gregorian::date d(gregorian::not_a_date_time); if (dst_calc_rules_) { d = dst_calc_rules_->end_day(y); } return posix_time::ptime(d, dst_offsets_.dst_end_offset_); } //! Base offset from UTC for zone (eg: -07:30:00) virtual time_duration_type base_utc_offset() const { return base_utc_offset_; } //! Adjustment forward or back made while DST is in effect virtual time_duration_type dst_offset() const { return dst_offsets_.dst_adjust_; } //! Returns a POSIX time_zone string for this object virtual string_type to_posix_string() const { // std offset dst [offset],start[/time],end[/time] - w/o spaces stringstream_type ss; ss.fill('0'); boost::shared_ptr<dst_calc_rule> no_rules; // std ss << std_zone_abbrev(); // offset if(base_utc_offset().is_negative()) { // inverting the sign guarantees we get two digits ss << '-' << std::setw(2) << base_utc_offset().invert_sign().hours(); } else { ss << '+' << std::setw(2) << base_utc_offset().hours(); } if(base_utc_offset().minutes() != 0 || base_utc_offset().seconds() != 0) { ss << ':' << std::setw(2) << base_utc_offset().minutes(); if(base_utc_offset().seconds() != 0) { ss << ':' << std::setw(2) << base_utc_offset().seconds(); } } if(dst_calc_rules_ != no_rules) { // dst ss << dst_zone_abbrev(); // dst offset if(dst_offset().is_negative()) { // inverting the sign guarantees we get two digits ss << '-' << std::setw(2) << dst_offset().invert_sign().hours(); } else { ss << '+' << std::setw(2) << dst_offset().hours(); } if(dst_offset().minutes() != 0 || dst_offset().seconds() != 0) { ss << ':' << std::setw(2) << dst_offset().minutes(); if(dst_offset().seconds() != 0) { ss << ':' << std::setw(2) << dst_offset().seconds(); } } // start/time ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->start_rule_as_string()) << '/' << std::setw(2) << dst_offsets_.dst_start_offset_.hours() << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.minutes(); if(dst_offsets_.dst_start_offset_.seconds() != 0) { ss << ':' << std::setw(2) << dst_offsets_.dst_start_offset_.seconds(); } // end/time ss << ',' << date_time::convert_string_type<char, char_type>(dst_calc_rules_->end_rule_as_string()) << '/' << std::setw(2) << dst_offsets_.dst_end_offset_.hours() << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.minutes(); if(dst_offsets_.dst_end_offset_.seconds() != 0) { ss << ':' << std::setw(2) << dst_offsets_.dst_end_offset_.seconds(); } } return ss.str(); } private: time_zone_names zone_names_; bool has_dst_; time_duration_type base_utc_offset_; dst_adjustment_offsets dst_offsets_; boost::shared_ptr<dst_calc_rule> dst_calc_rules_; }; typedef custom_time_zone_base<char> custom_time_zone; } }//namespace #endif